Roll heater



H. E. MCCRERY ROLL HEATER u Filed July 27, 1927 2 Sheets-Sheet l vii-Lgf" i QW@ Jan; 22,1929; 1,699,902-

` H. E. MCCRERY ROLL HEATERy Filed July 27, 1927 2 sheetsfsheet 2 J? nocaocooc-ooom potentieel den., 22; i929..

lil l V. m E in lli o .nl .ri

HEATER.

This invention reiatesto roll heaters and niore pertieuleriy'to heaters for the rolle einployed for roiiing sheet ietei in elieet mille. te is Well known,` sheet metolrolis derive n their lient from the het sheets passed there between, lout it has been'tound tliot .the heet* io ere siigliiy tliielier in tlie central portion tlien it the edge portions'.

in importent object ofthe 'invention rs to provide o roll rlneater. vvhieli muy toe used "during vtile operation of the' rolle to resist in tine proper distribution of heet to the rolls to nieintoin the true cylindrieeil shapes thereof und thus provide rolled sheets of uniform tloielrnese. I,

i. further object is to provide e novel 2o iieeter e plurzilitr1 oi" which ere adopted to loe erranged adjacent the rolls and contorni in eurveture thereto. novel heating ineens being* 'provided for edeetuaily heating the rolle' without enueing theemcking thereof,

or other injuriee.

llr further olojeet is to Vprovide e lieeter iievirig e. cheminer which is open et its bottoni to vreceive u novel form oi3 burner7 the inner Well oilthe chamber being arranged. Se in proximity and conforming in curvature to roli whereby the liet products oi Cour 'nu' ion peeeing upwardly through the chemloer Willi transmit heet to 'the roll. Jrfurtiier object is to provide e. healer et die eherueter referred to Wiiieii ie" adopted to loe need dining the operation of tlie rolle inhield-is vprovided with small rollers edupted to facilitate the handling olf `the 'eiieetez t further oloiect is to provide :i heater Yiuiviug it ehemloer Ain which produets oi combustion ere adapted to flow upwardly, end e steek eommumeuting therewith to perinit the products of combustion to flow dovrnvverdly und thus maintain e iiigli temperature in the heating ohuinleer and pre renting, tlfie vproducts of iiurin' outrrerdiy into the feces of operators. i. ;it;i'ertlier object is to provide e. novel forro 'oi lourner tor the heater lil further object is to provide novel means .tor supporting the heater whereby the latter moy more emiy' from the rolle it' the latter e damagel to iiouild lor-eelt, sind tlius prevent trigtne lieeter end associated ports.

Vloeinpg pleeedin position not in use to meist 'in maintaining *die 'combustion from" @filer objects ind udventugee eli the' invention 'will heroine apparent during the course of the following deeeription.

.lin the drawings i lliure shown one embelliinent of the invention. in ,this showing, l

Figure l is e eide elevation oi the upperatus in operetiveposition edjaeent the, relis,

Figure 2 is e liorieontei sectionoivievv on line 22 of )Figure l., tliegee Supply means being omitted, f

Figure 3 is o, fragmentary pien vien7 of :i portion'oir' one heating easing rindtllo sup` portingmenne therefor,

Figure i is u det-oil section on. iine elf-fi oi' Figure i,

Figure 5de e eide elevation "of one of the burners, perte being shown in eeetiomend,

Figure .6de e detuii section on line G-- of Figure 5.

Referring to the drawings Athe numerati() designates upper and iorver rolls journailed in the usuel roll heuer ll ond adopted to roll metal sheets it?, fed therebetween. lile elemente deeeribed nre of the usuel con struction and iorm no part of the present invention.

Referring; to Figure el the numerals i3. 14, l5 und "L ,fleeignute ri plurality of heaters which ere iden in eonetruetion, und lienee only one ned be referred to in detail. purine; the normal operation of the rolle it 1s preferred that only tlie heaters 'i3 und 15 be employed; the other heaters ifi sind lil when the rolls ure proper tenujieruture therein, .Ween hesiter comprises inner; und outer Wells li' und 18 divided by Centrel Woll 19 to forni u burner cheminer 2O und on outiet i chamber or steek F21. `iiie eliumbere Q0 and 2i are closed by end vielle 22 the upper portions of which proj eet'outwfirdly beyond 'the easing-ee et 23 to iorin bearings for :i roiler. 2li. The outer Well 18 termi-notes oiiiove the neuter Well 19 'and ie tiered outwardly et its tower end ue et 25. Eeclrhenter further is provided with e plureiity of relatively snmll roiiers 26 vvliieli fire adapted to eonteet with one of the roiis 10 te properly space the heating eeeing therefrom. it will be obvious tiieittlie inner Weil lli' of eueli burner ie curved to conform to the curvature of one of the rolle 10 ond is errenged substantially parallel thereto.

A. burner indicated es e 'Whoie bythe numeral 27 is arranged inthe lower portion of each of the chambers 20, as indicated in Figure 4. Referring to Figures 2, 5 and (3, it will be noted that each burner includes concentric inner and outer sleeves 28 and 29 respectively, the inner sleeve being provided in its lower portion with outlet openings 230 while the outer` sleeve 29 is provided in its upper portion with similar outlet openings 31. A cap 32 is arranged at one end of the sleeve and is provided with a recess 33 in which the adjacent ends of the sleeves are arranged. An inlet cap 34 is arranged ad jacent the opposite ends of the sleeves 28 and 29 and is provided with an annular recess 35 in which the adjacent ends ot' the sleeves are received. A bolt 36 extends through the inner sleeve` the ends of the caps, and the end walls 22 of the associated burner casing as shown in Figure 2, this bolt serving as the means for securing the caps 32 and 34 against the burner tubes or sleeves 28 and 29. The cap is provided with a chamber 37 communicating with the space between the sleeves 28 and 29. this chamber also being provided with openings 38 similar to the openings 31 previously described. The cap 84 is provided in on'e side with an inlet conduit 39 through whiehgas flows into the sleeve 28.

The end of the conduit 39 is provided with an elbow 4() in which'is threaded the inner end of a mixing chamber 41 having openings 42 in which air is adapted to flow.

` A burner nozzle 43 fits into the outer end of l the mixing device 'and is providedwith a jet 44 which is"interehangeable according to the fuel being employed. A pipe 45 conneets the burner nozzle to a control valve 46 which, in turn, is connected to a pipe 47. The pipe 47 is provided with a relatively small pipe 48 extending therefrom and adapted to act as a pilot for the burner, will be apparent. A gas supply pipe 49 is connected to the pipe 47.

Meansl are providedtor supporting the heaters in proximity to the rolls and foi-,permittiner movement of the heaters away from the nolls if they latter should break, the outward movement of the heaters serving to pre vent damage thereto. Referring to Figures i, El and Il. the numeral 50 designates a bracket above which is mounted an arm 5l. A bolt 52 is threaded in the arm 51 and has a' cylindrical lower end slidably received in the opening in thc bracket 50.' The outer end of the arm 51 is pivotally connected by a bolt 53 to an inner arm 54 which is normally arranged at an angle to the arm 51, shown in Figure yThe'bolt 53 entends upwardly a substantial distance above the arms 51 and 54 and is surrounded b v a coil spring 55, the tension of which may be adjusted by a nut 56. One of the arms 54 and associated elements is provided for each end of aeoaeoe each of the heaters and the end walls of the latter are provided with ears 57 which rest upon the arms 54. A. bolt 58 is threaded in the inner end of each arm 54 and slidahly received in each of the ears 57.

Theoperat-ion of the apparatus is as fol lows:

Gas is supplied to the. inner sleeve' 28. from the nozzle 43, through the mixing device 41, elbow 4.0 and inlet'conduit Air is admitted into the miXinv device through the openings 42, as will Je apparent. 'It has been found that the mixture ot air and gas in the mixing device. which is of the usual construction, is ineiicient for making a perfect combustible mixture. Accordingly the sleeves 28 and 29 are provided and it has been found that this structure greatly increases the eflieieney of the explosive mixture by more eiiciently mixing the air and gas whereby perfect combustion is obtained. The gas and air How outwardly1 from the sleeve 28 through' the openings 30 therein and circulate around the inner sleeve. The gas flows outwardly' romthe sleeves 29 through the openings 31 therein, the latter openingsproviding burner openings at which point the gaseous mixture is ignited. The provision of the openings 38 in the cap 34 serves to provide lflames substantially throughout the length of each roll. The flames pass upwardly through the burner chamber 20 and heat the inner -wall 17 thereof, heatv being transferred to the adjacent roll 10 to maintain the latter 'atthe proper temperature. `The^products of com-' bustion then flow downwardly through the outer chambers or stacks 2 1 to the atmosphere, these stacks serving to prevent the products of combustion. from flaring up"-ifn the faces of operators and also serving' to maintain a high temperature in the burner chambers.

As previously stated, the heaters 13 and ,15 ordinarily are employed 'while the rolflin'gI mill is in operation, while the heaters 14J and 16 are added when operation'ot the mill is stopped, to retain the rolls at the proper temperature. The rolls normally are heated by the hot sheets passing therebetween sov that only two heaters are necessary during the operation of the rolls. As pointed out, it has been toimd that the rolls become slightly eonraved trom end to end during theirnorinal operation and the provision of the heaters servesy more eilieiently to heat the rolls and retain the latter in their true cylindrical shapes. It is the rormnon practice lo pass sheets through the rolls and then return the. sheets to the inlet side ot' the rollsl whereby they again mary pass therebetween. T his action usually isaecomplished by passing the sheets back' over the upper roll 10 after each rolling operatiom-.and the roller-s 24 of the heaters 15 and-"'13 facilitate the removal of upper ends, the lower ends of said chambers' being-open, vsaid inner wall being curved to coniorm to the curvature of and adapted to be arranged adjacent the roll, a pair of concentric spaced pipes extending -through thel opeh end of Asaid inner chamber arallel to said inner wall, the inner pipe vided in its bottom portion with a plurality of outlet openings, the outer pipe being provided inits upper portion with a plurality of burner openings, a pair of caps engaging and covering the ends of said pipes, onel of said caps being relatively long and provided with a transversely extending conduit communicating with said inner pipe, said last named cap being provided with -a space communicating u/ith the space between said pipes and provided with burner openings arranged in the top portion thereo, and means for supplying a mixture of gas and air to said conduit. 8. A roll heater comprising a casing including inner and outer walls and a central wall dividing the casing into inner and outer chambers communicating at their upper ends, 'the lower ends of said chambers being open, said inner wall being curved to conform to the curvature of and adapted to be arranged adjacent a roll, a heating element arranged in the open end of said inner chamber, and means for supporting said heater for movement toward and away from the roll.

9. A roll heater comprising a `casing including innen and outer walls and a central wall dividing the Casing into inner and `outer chambers communicating at their upper ends, the lower ends of said chambers being open, said inner wall being curved Ato conform to the curvature of and adapted to be arranged adjacent a roll, a heating element arranged in the'open end of said inner chamber, and a pair of arms arranged adjacent each end of said casing and pivotally connected to each other, one end of one arm of cach pair being pivotally supported, the free end of the other arm of each pair being pivotally connected towsaid casing.

10.'The-combination with a rolling nnll including a pair of rolls and journal lions eing pro ings therefor, supporting members caried by said housings, a 'pair of arms pivotally connected at one end to said lsu porting members, a pair of' arms pivotal y connected at one end 'to the opposite ends of said first named arms, means opposing turning movement between said arms, and a'roll heater carried-by said last named arm and adapted tombe arranged in proximity to one of the ro s.

v11. The combination with a. vrolling mill including a pairof rolls and journal housings therefor, of a roll heater. supported by v said housings ad'acentone of said.rolls,iend a freely rotataile roller carried by the upper portion of said heater .and projecting thereabove- 12. A' roll heater lcomprising a casing including a pair of chambers communicating at their upper ends and having their lower ends ope-n, one of saidchalnbers being provided with a wall arranged adjacent the roll, and a heating elementnrranged in the lower end of said last mentioned chamber, the lower end of the other: chamber being arranged a, substantial distance above the lower end of said first mentioned chamber.

13. 'A roll heater comprising a casing j including a chamber having an open lower.

end and including an inner wall arranged adjacent the roll and curved to conform to the curvature thereof, and a downwardly extending stack communicating at its upper end with the upper end of said chamber and having its lower end open and arranged substantial distance above the open lower end of said chamber.

i4. A rollheater comprisinglalwall having a portion arrangedl adjacent and conforming in curvaturetothe roll, the remaining portion of said wall bein turned downwardly and spaced from tfe first named portion thereof and having` itsvlower end terminating a substantial distance above the lower end of the first mentioned portion, a

partition wall arranged between the'portions nanou) E. Meerman 

